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The Terms & Conditions of the Pay Monthly Airtime 2017, do not state how it collects users information. However, the Privacy Policy states broadly when Vodafone gathers personal information including the "Use of our network and other Vodafone products or services"as can be the Pay Monthly Airtime"":

"Collecting your personal information

We can get your personal information when you:

Buy a product or service from us (including buying products online, over the phone and in a retail store or other retail outlet)

Register for a specific product or service (such as registering your name and address details for a Pay as you go phone or setting up an email account with us)

Subscribe to newsletters, alerts or other services from us

Ask us for more information about a product or service, or contact us with a question or complaint

Take part in a competition, prize draw or survey

Use our network and other Vodafone products or services

Visit or browse our website or other Vodafone Group websites

We may also collect information about you from other organisations, if this is appropriate. These include fraud-prevention agencies, business directories and credit reference agencies. We may also collect information about you from other companies, our business, or joint venture partners."